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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd86b3a66ad423d6252cc610f26760556ff519ddade026480cd1dffc5cd79cc' 
  AND token = '/qIWj/qLnBatyjAfhzsl/LHlw4C7f1qoCJrvLePxwHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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