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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2ac45808d9e33eb59d02114d0ca9abb10dc5a623ee3d92906db8352c4a1299' 
  AND token = 'k0+G3ktrPYI4/ephO43xdVDL/zlroosU79al2eVqTWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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