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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02358487f60fa4a36664509c37846a5e3b1ecf73b813ca5df0b64cb11682ef8b' 
  AND token = 'uAEh74aaS4gOt1NgAq9W/VyRHI+k/pHysrDnKNVWiFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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