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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01caee043107ff08556a27ddf8eba3138fbc75144b11657864c24e31dc4e748f' 
  AND token = 'yS5IIPx5p0w9FRxK7nNlbV0Z4L7Gaz/Lf3spgFCelCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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