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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b1a63c23b11103ad4c6605a0df34514f0c5c6ccef2305451bb63f879603413' 
  AND token = 'IJ726zY8zGI7MG01yMBQgKE/A6jrvO2iQCChAjQfxtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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