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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323b4aeeb03fe211489fd561565132396c2fbc38103d89ef2f968c0164e8a415' 
  AND token = 'bXtxOhnqifYR4aS8wjEUEejZ98X7lNkjkZ5EvSA/0Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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