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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1093fcae07c149a5cf621808a07c8058f38a775f61430cb8e3f6fc9b1fbfc388' 
  AND token = 'nPIv0fJ/vOeh/1kMSi5sKW4DoySlCUn21CGjC3ocqW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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