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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de773fee2de8ddb0d87fe2e7b18205bc74e127f388d7c28737f392f965dc89fe' 
  AND token = 'k/OjDJFFptnauom0ZiI+H8TdvW6NWiYeNwWRCF2eCT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}