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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccf1ff44740406fce6f77c7f750f3219f208ad33cef001fe2d8d9703858a1e1' 
  AND token = 'NBVuoQefF0zY6Lif410yMtdpVABuN7vIYMra/gbL9q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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