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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2190b067112c33ab96351bd3bb75f566b79ca9e44aa2ff49d2855cfe4d7fb5fb' 
  AND token = '18oB0lVO42CKPb0rCHqfld0BBjaWCEu2Uy2cExmvGY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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