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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe65971e23331e940959af22cabd064803e5bb905015f101dd0a1b90233b72d' 
  AND token = 'E1RI4aABITkk+9Slcx7TU4Wo3DjrDJpqw/UNzbX+sko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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