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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6c65cc3293c2f7a34ae60666b096b9fdf6703cd976f520ee7d824d9032f6ed' 
  AND token = '3t91xORyBTZki0cfvkN36p5tnSp1FXLA8N37O8V8cyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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