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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2704bfa24dfdbec69cc849313388cdd6f1aa73e63c059a9870e143d1e318fe0' 
  AND token = '4dfiZ1yNKgDPM0w7wTaJyIjtB/CpnAd+jPAybGLlq4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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