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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f627caa49ecf396be936eb1cabe2037978e70de45ef987b624e80bf74b61d286' 
  AND token = '8o1Vmc1oprcAw3L4Es4H4TJYE/OmMAzzie+cy7F1FBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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