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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a628702f0722fa7b4bbee999e9653fcd4d10bf4251717330bd7ea0cfef49e28b' 
  AND token = 'fP91tNCkjI9YYpbz5ow/US50/e4LUb58L4D1IkF5uzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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