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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c33559cb3981ba5f2dcbe0054c5711f26ca1140e5d13c044bc886e607543e3' 
  AND token = 'PeBLNqpyTIJ2a/axCcPcUe520X92NkH44ZXXRsaw9lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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