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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289eb09d3d0d5dde725856deb197f195e8065f405c4658c8b2eb48b4d1d1d1a1' 
  AND token = '1QLgg3uEW27kONMSRSVc9lPrDuu80fMe9jmXJXj4PP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00141

JSON explain

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