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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a1f5e9500d4e1d8505c0fdedde4c2a306cc86840b0769a4fd70cfeae46c13b' 
  AND token = 'pSdZprUPaUFNX1yacgXG6izChdaQNfXO3DVYCfXYulM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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