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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a69c82e9a906cefedf3941a07806e471257f0095693469097d3c90b61a040a' 
  AND token = 'SoTypSS4JB3WO3cC3Mydi5yHWspyIvm+ggDGaovhpz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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