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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f671ec2e9149b769d71e9b88cc5ad23414f482a9240372a03b5551a03808e6' 
  AND token = '4Bc2L23DSwgaQL1iI5KkTlDtiSpKEPbyDZ7ZIm6xmL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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