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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daeb93f70f4155bce05164086c2061760a869f8fee175d3fb1f65482a5b7556a' 
  AND token = 'KysVI2jTsTXiaHNmw6C0eIm608GblyXl4K0EZYEB1oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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