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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad07e9dba0f4242ea4b9a6e5dd2e704d24aaed789c161355157e9e424fc6c06' 
  AND token = 'zTjJeQtePdTAj5dspAnnC2J71oRwqa/jG3JeMpXcxo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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