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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275e16dfb26a2f8745d4486994e4aa841303804f69413337f8d0d097486ef34c' 
  AND token = 'fPa50UWwaFS4bhOd3q+JCY9HlyvJILKROul9qzuKno8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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