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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239135476f70d233c87aab6c99cc3eafcee0461ca3dea73c2e00d5991f1c329e' 
  AND token = 'edxmf65nvy/uSCs1Wy0gPV3s6DEr6tSTRKNqGeLut+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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