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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7626e69b9724a913966a62a0f4252d8a478b5e44301e3664b321752da0c1a473' 
  AND token = 'Q0qh8BmwUbvGQq5x12UGYMx3xYyfcZ+hEf1v2V9XlI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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