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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a661221471404307f4aecb787db58838d37f82dc98c6987586a2ef57e51cbb78' 
  AND token = 'pOCdsKqLN45pNhRdTUzz5rCsabl89tMGn6gIlBcqvRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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