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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b4d9ab3841ffaabb1d90cf9426e65098e9b51f59a117017a9089fec1a9ab33' 
  AND token = 'bnwWPyvgqrn7k/Ltwhcps0BzXftnFA6e29WdenG5aNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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