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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a78b1768c7ea5df8fd269a13cfc6047127a2244fc8c8cf1eaf2cac783bbc4ef' 
  AND token = 'lju1Pyw+ahPAT7kvlQn5S7djIIR3EmPC5ZAn9taiTlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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