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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542a07789d407bd653e28a6bd01654961dcedd77fbfd6fda5d0563d3a7a40f8a' 
  AND token = 'f/QiZvDkG+S1cL8mEfUepzjf4aCvJAWuGncmnP3BMLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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