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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e48da3dee5cc61e459071dd9b393d8ff507e1059cd83f1cbc08cff21d04567' 
  AND token = 'SJLQWZnDseITWQBCSIlMnZNBA8o37vIztJlcdOiUGqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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