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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fca337a47d2df28f7c8861e27d903b88b239b3d5f2b99eaf48640bf34e2d29' 
  AND token = 'AIIrz33vVje84seV0RDtBIwSlsjzndc8rXSl9y0BpiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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