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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c66322cf7e059dd49e5a9547e75eeccfe76adb7629590ca0bc7dfb21c44a2b2' 
  AND token = 'lAMaeMeKmTdHRQh8MqPDNpA8OAEUS7p4jDFV75aAW+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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