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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f0690b3b8a0de0860a3d856df7ccc3457404d4c2d63caca668af542c52634e' 
  AND token = 'pchNpHUI1Bm0LU+wyJUbx4rgkjDDUIq33eBqQ4hE4Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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