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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4b6b6d4063e2264b5daeba9ae6a3e7cc53b120e37d3036fbb9fec7c656dd93' 
  AND token = 'YgJYr4BG1cq3EZkU9PzJRtu/xED/6ySHOJwR7/RAC2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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