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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bcb2f9c967ac57f95fdd81257c9d7adbdaf6ad77c201eac09ec0fd7e9c2e59' 
  AND token = 'fr1HKRBLAwtyrGmDLmES8pph1+nQG8vCUpm/Si413vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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