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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48681da0b69bd4956209b64438624358ff77c68935f3ede6b3b941f7880dba24' 
  AND token = 'p9t7ESTYHVnmPEpwMwQIf42R3Wx0eQ3zbwTgqmE7Q9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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