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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca0660642538d9c45d04ae666a4627d58f01faef6b5eb006cf53e809a18f2de' 
  AND token = '+Npt/wo80/NkpFH+JTmeOW4XjSsSgba2cf/AaKJSQoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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