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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9860a305e7fda87f57f305aff3bf2e3ccf03bd0239ffb79ea1aa857e4ff055ac' 
  AND token = 'DlSuiq3NEQORiZ3jZ2XSDnUAK1SLPMDTz0IYnrp+uzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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