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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df72c358f64167893c16b84ef7dc17e7cd994e3111e5089fbb72e7bd151721b' 
  AND token = 'fUjOv/La38Qk5jjeZGj0iBDzsPaECA2ETZPR74Iib04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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