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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d622bb24bc38c25d587010467d97447e4469ec667a68eb93fefd2d2e87c33f3' 
  AND token = 'pf5vErFJsNDE8GEPJPOCvu5JL76xCwzzo8LKg073wKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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