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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee036009a9a2a59ce1f9347082b885132da805d141c7279f4c0e60a80362548' 
  AND token = 'PACD/EP3s0vhvu8LBry0olxrUH4PpXqexV8BD06EHRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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