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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f2c56165cddf04b09c555566eacd0d8ea348003387c2bd8224f968434194c3' 
  AND token = '50lEeOyNHKe1ukJCZJ4xm5XaR+Vr95lQlfEuOZ0Gc0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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