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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4085230e9889286d01238b0b04284784e0f9ca433eef8502e45c703d92160a' 
  AND token = 'oiDzaCWyE8jwXDvIz7pF2dDQYKNAPVb0h5iBAIgBU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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