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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431ce80482c5fbb3d7dc4024e3217d45079505fe1e14a1f97e6f7ae3b012e68b' 
  AND token = 'd48m4HZBuobx6e4FybpdtNhYPgAPhAKWceU6FDYXoLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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