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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea94d11a5aee8529a077ef2f73f0fbe80be3c2810a5847e6ba1a3fa4ad24018' 
  AND token = 'vLTC15dp/IlS98W4KcaD3+PzJE1T+G5rPgHRuDXVpm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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