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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8b4cef98bd62722eb32f9120fd74c5376d5a260e64492dce13b4ac05277858' 
  AND token = 'paOemZVDj1t45aZX4q9zejOijBjkmnQsSoSWJQll4yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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