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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9851346f903bbdf81982cce35b15a6b2ceb09bc14b817f25f36df1150932846' 
  AND token = 'RALy5N39NBRXzQwax44TEN6X9l5n1OLP//TXEYxJ7U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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