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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd9329adc20d29e9a143c8d476f48a13ea14257264992032c5ca4c95bb9de2c' 
  AND token = 'cjGv65HKDhZWKdt1x4JQ4Efu7HB5w/zdYIsEagAdKFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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