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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4a26d1f05218e06b326d0a830239e000434fcacd5c7d1918fea95a3c90a760' 
  AND token = 'oFjAlO1th+TdChWV7RNBr03tG7T7xuWpdSXmdCqydto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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