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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e208cf0a7379562b2443c42c7abe127ca0da3b9203b638993b43f0bb67f95027' 
  AND token = 'gy1gPToyxz6G4X0XThNSAOGj0qsj1gK/XmCOALWbivw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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