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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d76457b856291d08c7a6f7ceb227898d7bc5dbaaa7ac70f3831eea3edfe936' 
  AND token = 'X3s9YVPgqhQLQWI04mH79xDecQ2MTQjCT2YKexbZqD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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