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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06a2520ebce430564263cbbe7a842732ad00cc4b0d8977c2a5381d14974941c' 
  AND token = 'CrT3/nMzh0K+EVlaGlghQY3dj6aRezkbz3cBsSu7vFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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