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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b11cf7887c34ed10b824bef2c6ba9283624539993e5cf8bc36a184271b77b4' 
  AND token = 'flgeedLVSxDtOaRdx+2+QVtZV1PjpDnBJ2t6hvtlt7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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