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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e544ca7698d09bc51e4cb2ff23ece24c966860c6076b88ee067f866388d40f8' 
  AND token = 'OUCgzc2sr3C55F7yq5DeR2gHlCd70nxyLSejQy3QFUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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