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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72353f27eea908de592ccbe958ea58862a06329d72340c7f4397b113722e52c' 
  AND token = '/mRJktzSys6J12iQMQN11CyxwHYgGWGlgpiwGkBdp5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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