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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3afc944c7e4145a19eca48b2de76c33a6f6bf4ab0eaa7c9fc0f4b94355bbb4' 
  AND token = 'VFoCrAq+dHJT6xWMajSUYuWQ4bjNoFdM6NGXoD/JOG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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