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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cf122672d0f03eb15a41fd8dea713241c1cab24a40407c8647eef273b90fe7' 
  AND token = 'yJwc7xv7meEivWdmUgAis9u9jxHNy1NFVq4NHVobaf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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