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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8702b9d3fd94383c54c91e018a2c29c583aa10f3292d6780452a1395e6f32556' 
  AND token = 'rF5p0HVoEY18dAJDb4hL47W4AbC4/wnx+g4hhr8faHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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