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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c44b24344907217eb0cdfeeba3c1ceb51566c5f184cf2efbdcf151c57e9bcf' 
  AND token = 'JbkAOZHrs7RKuLIodVQJtnNlI3RycYy3b+wymNihBNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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